arXiv subjects

Danilo Merlini

Publications and source records attributed to Danilo Merlini.

12 recordsLinked to original sources

arXiv2019

Analysis of a Complex approximation to the Li-Keiper coefficients around the K Function

We introduce a kind of "perturbation" for the Li-Keiper coefficients around the Koebe function (the K function) and establish a closed system of Equations for the Li-Keiper coefficients. We then check the correctness of some of the many possible solutions offered by the system ,related to the discrete derivative of order n of a function. We also report numerical finding which support our stability conjecture that the tiny part lambda-tiny(n) (the fluctuations around the trend) are bounded in absolute values by gammaxn, where gamma is the Euler-Mascheroni constant.

math.GM↗

arXiv2013

Riemann Hypothesis: Architecture of a conjecture "along" the lines of P\'olya. From trivial zeros and Harmonic Oscillator to information about non-trivial zeros of the Riemann zeta-function

We propose an architecture of a conjecture concerning the Riemann Hypothesis in the form of an "alternative" to the P\'olya strategy: we construct a Hamiltonian H_Polya whose spectrum coincides exactly with that of the Harmonic Oscillator Hamiltonian H_osc if and only if the Riemann Hypothesis holds true. In other words, it can be said that we formulate the Riemann Hypothesis by means of a non-commutative structure on the real axis, viz., that of the Harmonic Oscillator, by an equation of the type H_Polya(H_osc) = H_osc: the Harmonic Oscillator operator, if viewed as an argument of H_Polya, reproduces itself.

math.NT↗

arXiv2010

A few equalities involving integrals of the logarithm of the Riemann zeta-function and equivalent to the Riemann hypothesis III. Exponential weight functions

This paper is a continuation of our recent papers with the same title, arXiv:0806.1596v1 [math.NT], arXiv:0904.1277v1 where a number of integral equalities involving integrals of the logarithm of the Riemann zeta-function were introduced and it was shown that some of them are equivalent to the Riemann hypothesis. A few new equalities of this type, which this time involve exponential functions, are established, and for the first time we have found equalities involving the integrals of the logarithm of the Riemann zeta-function taken exclusively along the real axis. Some of the equalities we have found are tested numerically. In particular, an integral equality involving the logarithm of abs(zeta(1/2+it)) and a weight function cosh(pi*t)^(-1) is shown numerically to be correct up to the 80 digits. For exponential weight function exp(-at), the possible contribution of the Riemann function zeroes non-lying on the critical line is rigorously estimated and shown to be extremely small, in particular, smaller than trillion of digits, 10^(-10^(13)), for a=4*pi.

math.NT↗

arXiv2009

A few equalities involving integrals of the logarithm of the Riemann zeta-function and equivalent to the Riemann hypothesis II

This paper is a continuation of our recent paper with the same title, arXiv:0806.1596v1 [math.NT], where a number of integral equalities involving integrals of the logarithm of the Riemann zeta-function were introduced and it was shown that some of them are equivalent to the Riemann hypothesis. A few new equalities of this type are established; contrary to the preceding paper the focus now is on integrals involving the argument of the Riemann zeta-function (imaginary part of logarithm) rather than the logarithm of its module (real part of logarithm). Preliminary results of the numerical research performed using these equalities to test the Riemann hypothesis are presented. Our integral equalities, together with the equalities given in the previous paper, include all earlier known criteria of this kind, viz. Wang, Volchkov and Balazard-Saias-Yor criteria, which are certain particular cases of the general approach proposed.

math.NT↗

arXiv2009

Mean Staircase of the Riemann Zeros: a comment on the Lambert W function and an algebraic aspect

In this note we discuss explicitly the structure of two simple set of zeros which are associated with the mean staircase emerging from the zeta function and we specify a solution using the Lambert W function. The argument of it may then be set equal to a special $N \times N$ classical matrix (for every $N$) related to the Hamiltonian of the Mehta-Dyson model. In this way we specify a function of an hermitean operator whose eigenvalues are the "trivial zeros" on the critical line. The first set of trivial zeros is defined by the relations $\tmop{Im} (ζ({1/2} + i \cdot t)) = 0 \wedge \tmop{Re} (ζ({1/2} + i \cdot t)) \neq 0$ and viceversa for the second set. (To distinguish from the usual trivial zeros $s = ρ+ i \cdot t = - 2 n$, $n \geqslant 1$ integer)

math.NT↗

arXiv2008

A few equalities involving integrals of the logarithm of the Riemann Zeta-function and equivalent to the Riemann hypothesis

Using a generalized Littlewood theorem concerning integrals of the logarithm of analytical functions, we have established a few equalities involving integrals of the logarithm of the Riemann Zeta-function and have rigorously proven that they are equivalent to the Riemann hypothesis. Separate consideration for imaginary and real parts of these equalities, which deal correspondingly with the integrals of the logarithm of the module of the Riemann function and with the integrals of its argument is given. Preliminary results of the numerical research performed using these equalities to test the Riemann hypothesis are presented.

math.NT↗

arXiv2008

A Hidden Symmetry Related to the Riemann Hypothesis with the Primes into the Critical Strip

In this note concerning integrals involving the logarithm of the Riemann Zeta function, we extend some treatments given in previous pioneering works on the subject and introduce a more general set of Lorentz measures. We first obtain two new equivalent formulations of the Riemann Hypothesis (RH). Then with a special choice of the measure we formulate the RH as a ``hidden symmetry'', a global symmetry which connects the region outside the critical strip with that inside the critical strip. The Zeta function with all the primes appears as argument of the Zeta function in the critical strip. We then illustrate the treatment by a simple numerical experiment. The representation we obtain go a little more in the direction to believe that RH may eventually be true.

math.NT↗

arXiv2007

Other representations of the Riemann Zeta function and an additional reformulation of the Riemann Hypothesis

New expansions for some functions related to the Zeta function in terms of the Pochhammer's polynomials are given (coefficients b(k), d(k), d_(k) and d__(k). In some formal limit our expansion b(k) obtained via the alternating series gives the regularized expansion of Maslanka for the Zeta function. The real and the imaginary part of the function on the critical line is obtained with a good accuracy up to Im(s) = t < 35. Then, we give the expansion (coefficient d_(k)) for the derivative of ln((s-1)ζ(s)). The critical function of the derivative, whose bounded values for Re(s) > 1/2 at large values of k should ensure the truth of the Riemann Hypothesis (RH), is obtained either by means of the primes or by means of the zeros (trivial and non-trivial) of the Zeta function. In a numerical experiment performed up to high values of k i.e. up to k = 10^13 we obtain a very good agreement between the two functions, with the emergence of twelve oscillations with stable amplitude. For a special case of values of the two parameters entering in the general Pochhammer's expansion it is argued that the bound on the critical function should be given by the Euler constant gamma.

math.NT↗

arXiv2006

Riemann Hypothesis: a special case of the Riesz and Hardy-Littlewood wave and a numerical treatment of the Baez-Duarte coefficients up to some billions in the k-variable

We consider the Riesz and Hardy-Littlewood wave i.e. a ``critical function'' whose behaviour is concerned with the possible truth of the Riemann Hypothesis (RH). The function is studied numerically for the case alpha = 15/2 and beta = 4 in some range of the critical strip, using Maple 10. In the experiments, N = 2000 is the maximum argument used in the Moebius function appearing in c_k i.e. the coefficients of Baez-Duarte, in the representation of the inverse of the Zeta function by means of the Pochammer's polynomials. The numerical results give some evidence that the critical function is bounded for Re(s) > 1/2 and such an ``evidence'' is stronger in the region Re(s) > 3/4} where the wave seems to decay slowly. This give further support in favour of the absence of zeros of the Riemann Zeta function in some regions of the critical strip (Re(s) > 3/4) and a (weaker) support in the direction to believe that the RH may be true (Re(s) > 1/2).

math.NT↗

arXiv2006

Riemann Hypothesis: The Riesz-Hardy-Littlewood wave in the long wavelength region

We present the results of numerical experiments in connection with the Riesz and Hardy-Littlewood criteria for the truth of the Riemann Hypothesis (RH). The coefficients c_k of the Pochammer's expansion for the reciprocal of the Riemann Zeta function, as well as the ``critical functions'' c_k*k^a (where a is some constant), are analyzed at relatively large values of k. It appears an oscillatory behaviour (Riesz-Hardy-Littlewood wave). The amplitudes and the wavelength of the wave are compared with an analytical treatment concerning the wave in the asymptotic region. The agreement is satisfactory. We then find numerically that in the large beta limit too, the amplitudes of the waves appear to be bounded. For a special case the numerical experiments are performed up to larger values of k, i.e k=10^9 and more. The analysis suggests that RH may barely be true and an absolute bound for the amplitudes of the waves in all cases should be given by |1/(zeta(1/2)+epsilon) -1|, with epsilon arbitrarily small positive, i.e. equal to 1.68

math.NT↗

arXiv2006

The criteria of Riesz, Hardy-Littlewood et al. for the Riemann Hypothesis revisited using similar functions

The original criteria of Riesz and of Hardy-Littlewood concerning the truth of the Riemann Hypothesis (RH) are revisited and further investigated in light of the recent formulations and results of Maslanka and of Baez-Duarte concerning a representation of the Riemann Zeta function. Then we introduce a general set of similar functions with the emergence of Poisson-like distributions and we present some numerical experiments which indicate that the RH may barely be true.

math.NT↗

arXiv2005

The Riemann Magneton of the Primes

We present a calculation involving a function related to the Riemann Zeta function and suggested by two recent works concerning the Riemann Hypothesis: one by Balazard, Saias and Yor and the other by Volchkov. We define an integral m (r) involving the Zeta function in the complex variable s = r + it and find a particurarly interesting expression for m(r) which is rigorous at least in some range of r. In such a range we find that there are two discontinuities of the derivative m'(r) at r = 1 and r = 0, which we calculate exactly. The jump at r = 1 is given by 4*Pi, while that at r = 0 is given by (-4 + gamma + 3*log(2) + Pi/2)*Pi. The validity of the expression for m(r) up to r = 1/2 is equivalent to the truth of the Riemann Hypothesis (RH). Assuming RH the expression for m(r) gives m = 0 at r = 1/2 and the slope m'(r) = Pi*(1 + gamma) = 4.95 at r = 1/2 (where gamma = 0.577215... is the Euler constant). As a consequence, if the expression for m(r) can be continued up to r = 1/2, then if we interpret m(r) as the effective potential of a charged filament, in the presence of the unit charges located at all the zeros (trivial and non trivial zeros) and at the pole in one of the Riemann Zeta function then there is a jump of the electric field E(r) = m'(r) at r = 1/2 given by 2*Pi times the first Li's coefficient lambda_1 = [1+gamma/2-(1/2)ln(4*Pi)] = 0.0230957. We then construct a potential well (a symmetric function around x = r+1/2 = 1) which is exact if the RH is true. Independently of the RH, by looking at the behaviour of the convergent Taylor expansion of m(r) at r = 1-, the value m(r = 1/2+) as well as the first Li's coefficient may be evaluated using the Euler product formula. We give in this way further evidence for the possible truth of the Riemann Hypothesis.

math-ph↗